Helmi, B., and J. A. Saragih. “Efforts to Improve Learning Outcomes Meroda In Floor Exercise Learning Through Teaching Style Command On High School Student Class XI GKPS 1 Simalungun Pematang Raya Academic Year 2015/2016: Efforts to Improve Learning Outcomes Meroda In Floor Exercise Learning Through Teaching Style Command On High School Student Class XI GKPS 1 Simalungun Pematang Raya Academic Year 2015/2016”. Journal of Midwifery and Nursing, vol. 2, no. 1, Dec. 2019, pp. 177-9, https://www.ejournal.iocscience.org/index.php/JMN/article/view/470.